Revert "[IRGen] Emit lifetime intrinsics around temporary aggregate argument allocas"

This reverts commit fafc6e4.

Should fix ppc stage2 failure: http://lab.llvm.org:8011/builders/clang-ppc64be-linux-multistage/builds/23546

Conflicts:
	clang/lib/CodeGen/CGCall.cpp

Author: epilk

clang/lib/CodeGen/CGCall.cpp

@@ -3692,24 +3692,7 @@ void CodeGenFunction::EmitCallArg(CallArgList &args, const Expr *E,
     return;
   }
 
-  AggValueSlot ArgSlot = AggValueSlot::ignored();
-  Address ArgSlotAlloca = Address::invalid();
-  if (hasAggregateEvaluationKind(E->getType())) {
-    ArgSlot = CreateAggTemp(E->getType(), "agg.tmp", &ArgSlotAlloca);
-
-    // Emit a lifetime start/end for this temporary. If the type has a
-    // destructor, then we need to keep it alive. FIXME: We should still be able
-    // to end the lifetime after the destructor returns.
-    if (!E->getType().isDestructedType()) {
-      uint64_t size =
-          CGM.getDataLayout().getTypeAllocSize(ConvertTypeForMem(E->getType()));
-      if (auto *lifetimeSize =
-              EmitLifetimeStart(size, ArgSlotAlloca.getPointer()))
-        args.addLifetimeCleanup({ArgSlotAlloca.getPointer(), lifetimeSize});
-    }
-  }
-
-  args.add(EmitAnyExpr(E, ArgSlot), type);
+  args.add(EmitAnyExprToTemp(E), type);
 }
 
 QualType CodeGenFunction::getVarArgType(const Expr *Arg) {
@@ -4810,9 +4793,6 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
   for (CallLifetimeEnd &LifetimeEnd : CallLifetimeEndAfterCall)
     LifetimeEnd.Emit(*this, /*Flags=*/{});
 
-  for (auto &LT : CallArgs.getLifetimeCleanups())
-    EmitLifetimeEnd(LT.Size, LT.Addr);
-
   return Ret;
 }
 

clang/lib/CodeGen/CGCall.h

@@ -283,11 +283,6 @@ class CallArgList : public SmallVector<CallArg, 8> {
     llvm::Instruction *IsActiveIP;
   };
 
-  struct EndLifetimeInfo {
-    llvm::Value *Addr;
-    llvm::Value *Size;
-  };
-
   void add(RValue rvalue, QualType type) { push_back(CallArg(rvalue, type)); }
 
   void addUncopiedAggregate(LValue LV, QualType type) {
@@ -304,9 +299,6 @@ class CallArgList : public SmallVector<CallArg, 8> {
     CleanupsToDeactivate.insert(CleanupsToDeactivate.end(),
                                 other.CleanupsToDeactivate.begin(),
                                 other.CleanupsToDeactivate.end());
-    LifetimeCleanups.insert(LifetimeCleanups.end(),
-                            other.LifetimeCleanups.begin(),
-                            other.LifetimeCleanups.end());
     assert(!(StackBase && other.StackBase) && "can't merge stackbases");
     if (!StackBase)
       StackBase = other.StackBase;
@@ -346,14 +338,6 @@ class CallArgList : public SmallVector<CallArg, 8> {
   /// memory.
   bool isUsingInAlloca() const { return StackBase; }
 
-  void addLifetimeCleanup(EndLifetimeInfo Info) {
-    LifetimeCleanups.push_back(Info);
-  }
-
-  ArrayRef<EndLifetimeInfo> getLifetimeCleanups() const {
-    return LifetimeCleanups;
-  }
-
 private:
   SmallVector<Writeback, 1> Writebacks;
 
@@ -362,10 +346,6 @@ class CallArgList : public SmallVector<CallArg, 8> {
   /// occurs.
   SmallVector<CallArgCleanup, 1> CleanupsToDeactivate;
 
-  /// Lifetime information needed to call llvm.lifetime.end for any temporary
-  /// argument allocas.
-  SmallVector<EndLifetimeInfo, 2> LifetimeCleanups;
-
   /// The stacksave call.  It dominates all of the argument evaluation.
   llvm::CallInst *StackBase;
 };

clang/test/CodeGen/lifetime-call-temp.c

@@ -26,8 +26,6 @@ const char * f(S s)
 // CHECK: [[T2:%.*]] = alloca %class.T, align 4
 // CHECK: [[T3:%.*]] = alloca %class.T, align 4
 //
-// CHECK: [[AGG:%.*]] = alloca %class.S, align 4
-//
 // FIXME: We could defer starting the lifetime of the return object of concat
 // until the call.
 // CHECK: [[T1i8:%.*]] = bitcast %class.T* [[T1]] to i8*
@@ -39,15 +37,8 @@ const char * f(S s)
 //
 // CHECK: [[T3i8:%.*]] = bitcast %class.T* [[T3]] to i8*
 // CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T3i8]])
-//
-// CHECK: [[AGGi8:%.*]] = bitcast %class.S* [[AGG]] to i8*
-// CHECK: call void @llvm.lifetime.start.p0i8(i64 8, i8* [[AGGi8]])
-//
 // CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* [[T3]], [2 x i32] %{{.*}})
 //
-// CHECK: [[AGGi8:%.*]] = bitcast %class.S* {{.*}} to i8*
-// CHECK: call void @llvm.lifetime.end.p0i8(i64 8, i8* [[AGGi8]])
-//
 // CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret [[T1]], %class.T* [[T2]], %class.T* dereferenceable(16) [[T3]])
 // CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* [[T1]])
 //